// WITH_RUNTIME
// INTENTION_TEXT: "Replace with 'map{}.toSet()'"
// INTENTION_TEXT_2: "Replace with 'asSequence().map{}.toSet()'"
import java.util.HashSet

fun foo(map: Map<Int, String>): Collection<Int> {
    val <caret>result = map.values
        .map { it.length }
        .toSet()
    return result
}